A Son of longtime, Chicago-based trainer, Hugh Robertson who trained millionaire Polar Expidition, McLean grew up working on his parent’s Pennsylvania farm. He attended the University of Nebraska, before committing to racetrack life.

He has been leading trainer at Canterbury Park ten times to 2013. Robertson also bases at Delaware Park and has been among Oaklawn’s top 10 trainers in recent years.

A top trainee is multiple graded winner Win Willy, who upset the 2009 Rebel Stakes (G2) going off at odds of 56-1. He also won the 2011 Oaklawn Handicap, became a millionaire when he won the Joseph French Memorial Handicap Stakes at Delaware Park in June. Willy makes his 2014 debut soon as a seasoned 8-year-old.

McLean won 15 stakes in 2013 and has been ranked in the top 40 trainers nationally for the past three years. As of January 2014, "Mac" has over 800 career wins.